It appears to be a GH grade. If the owner thinks it is a .410 it may shoot .410 slugs very well. If cheap enough, it would be an interesting gun to shoot slugs. Or it may have been chambered for .45 Long Colt. The barrels sleeved to the large chambers are probably ok to handle anything you could shoot in it. I find it interesting, and refinished it would be a unique Parker.
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